21221012102111 has 8 divisors (see below), whose sum is σ = 21243158350848. Its totient is φ = 21198866455000.

The previous prime is 21221012102099. The next prime is 21221012102149. The reversal of 21221012102111 is 11120121012212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21221012102111 - 2²⁶ = 21220944993247 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21221012102111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221012102161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121278836 + ... + 121453686.

It is an arithmetic number, because the mean of its divisors is an integer number (2655394793856).

Almost surely, 2^{21221012102111} is an apocalyptic number.

21221012102111 is a deficient number, since it is larger than the sum of its proper divisors (22146248737).

21221012102111 is a wasteful number, since it uses less digits than its factorization.

21221012102111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300813.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21221012102111 its reverse (11120121012212), we get a palindrome (32341133114323).

The spelling of 21221012102111 in words is "twenty-one trillion, two hundred twenty-one billion, twelve million, one hundred two thousand, one hundred eleven".